Date: Fri Sep 05 2003 - 12:55:23 CDT

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Those are either coming from Postfix or Procmail. The first is an effect
of mbox delivery, but the rest are likely in a fairly typical Postfix
delivery. Postfix obviously does the Received: line, and I can find lots
of cites in Google that state that Postfix inserts the Return-Path: from
the envelope sender. So you've got the envelope sender, the envelope
recipient, and the final delivery ID all in places that can easily be
found by formail (for example) and a little pattern matching.

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_ o
 |/)

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